The question is incomplete, the complete question is:
Standardization of a Borax solution (Na2B4O7). A student titrates a 20.00 mL sample of an aqueous borax solution with 1.044 M H2SO4. It takes 2.63 mL of acid to reach the equivalence point. Knowing it takes 1 H2SO4 to neutralize 2 Na2B4O7, what was the concentration of this Borax solution?
Answer: The concentration of borax solution is 0.069 M.
Explanation:
To calculate the concentration of borax solution, the formula used is:
[tex]n_1C_1V_1=n_2C_2V_2[/tex] ....(1)
where,
[tex]n_1, C_1\text{ and }V_1[/tex] are the n-factor, concentration and volume of sulfuric acid
[tex]n_2,C_2\text{ and }V_2[/tex] are the n-factor, concentration and volume of borax solution.
We are given:
[tex]n_1=1\\C_1=1.044M\\V_1=2.63mL\\n_2=2\\C_2=?M\\V_2=20mL[/tex]
Putting values in equation 1, we get:
[tex]1\times 1.044\times 2.63=2\times C_2\times 20\\\\C_2=\frac{1\times 1.044\times 2.63}{2\times 20}\\\\C_2=0.069M[/tex]
Hence, the concentration of borax solution is 0.069 M.
Silicon is in the same group of the Periodic Table as carbon. The compound
formed between silicon and hydrogen is likely to have the formula
SiHz
SiH
SizH:
SizHs
Please hurry
Answer:
SiH
Explanation:
The symbol for Silicon is Si, and the symbol for Hydrogen is H. There is no need for extra characters in the name.
PCl5 <-> PCl3 + Cl2
PCl5 decomposes into PCl3 and Cl2 according to the equation above. A pure sample of Pcl5 is placed in a rigid, evacuated 1.00 L container. The initial pressure of the PCl5 is 1.00 atm. The temperature is held constant until the PCl5 reaches equilibrium with its decomposition products. The figures below shows the initial and equilibrium conditions of the system.
As the reaction progresses toward equilibrium, the rate of the forward reaction
A) increases until it becomes the same as the reverse reaction rate at equilibrium
B) stays constant before and after equilibrium is reached
C) decreases to become a constant nonzero rate at equilibrium
D) decreases to become zero at equilibrium
Answer:
PCl5 <-> PCl3 + Cl2
PCl5 decomposes into PCl3 and Cl2 according to the equation above. A pure sample of Pcl5 is placed in a rigid, evacuated 1.00 L container. The initial pressure of the PCl5 is 1.00 atm. The temperature is held constant until the PCl5 reaches equilibrium with its decomposition products. The figures below show the initial and equilibrium conditions of the system.
As the reaction progresses toward equilibrium, the rate of the forward reaction
A) increases until it becomes the same as the reverse reaction rate at equilibrium
B) stays constant before and after equilibrium is reached
C) decreases to become a constant nonzero rate at equilibrium
D) decreases to become zero at equilibrium
Explanation:
At equilibrium, both forward and backward reactions take place with constant speed.
The reaction will never cease.
Due to this reason chemical equilibrium is called dynamic in nature.
At equilibrium:
the rate of forward reaction = rate of backward reaction
As the reaction progresses toward equilibrium, the rate of the forward reaction decreases to become a constant nonzero rate at equilibrium.
Answer is option C).
When a system is in a state of chemical equilibrium, neither the reactant concentration nor the product concentration changes over time, nor does the system exhibit any further changes in its attributes. Here the correct option is C.
The system reaches a condition of chemical equilibrium when the rate of the forward reaction equals the rate of the reverse reaction. The system is considered to be in a state of dynamic equilibrium when the concentrations of the reactants and products do not change further as a result of the equal rates of the forward and reverse processes.
Equilibrium is impacted by a number of variables, including temperature, pressure, and the system's concentration. Here at equilibrium the rate of the forward reaction decreases to become a constant nonzero rate at equilibrium.
Thus the correct option is C.
To know more about chemical equilibrium, visit;
https://brainly.com/question/4289021
#SPJ6
PLS HELP Discuss the phenomena of sunrise and sunset seen on Earth and describe how they will be different from the perspective of outer space. YOU WILL GET POINTS IF U DO THIS PLSSSSSS
Answer:
because you are cxloser
Explanation:
Which of the following can cause a population to decrease in size?
A Lack of rain
B. More births than deaths C. Plentiful food supplies
D. Organisms moving into an area, but not out.
Answer:
D
Explanation:
because when some organisms will move from one place to another the number of population will decrease
A solution of ammonia NH3(aq) is at equilibrium. How would the equilibrium
change if NH4+ were added to the solution?
Answer: The equilibrium will shift in the direction of [tex]NH_3[/tex]
Explanation:
The chemical equation for the aqueous solution of ammonia follows:
[tex]NH_3+H_2O\rightleftharpoons NH_4^++OH^-[/tex]
According to Le-chtelier's principle:
If there is any change in the variables of the reaction, then the equilibrium will shift in that direction of equilibrium to minimize the effect.
If we add more amount of [tex]NH_4^+[/tex] to the solution, more of the products will be present. But according to Le-chtelier's principle, to minimize this effect, the equilibrium will shift in the backward direction that in the direction of [tex]NH_3[/tex]
Hence, the equilibrium will shift in the direction of [tex]NH_3[/tex]
9. How many significant figures are in the measurement 1,300 g?
2
unlimited
3
4
Answer:
4
4, because when there is no number after decimal then all the numbers are considered significant even 0 is the last number.
Which method is best suited for separating a 500 mL sample of two miscible liquids whose boiling points differ by approximately 60°C?
A) use of a separators funnel
B) paper chromatography
C) evaporation
D) distillation
E) fractional distillation
Are you sure it’s d
Plz tell me
Answer:
? which question
Explanation:
(6) I need help very fast plsss
Which is made up of only one type of atom?
A.a solution
B.a homogeneous mixture
C.an element
D.a compound
Answer:
C. an element
Explanation:
Elements are pure substances and made up of only one type of atoms which cannot be further broken down.
what type of solids conduct electricity in water: ionic, covalent, metallic?
Answer:
Ionic compounds are crystalline solids, soluble in water and conduct electricity when molten or in solution. These characteristics are due to the type of link that holds them together.
PLEASEEEE HELPPPPP!!
Answer:
Its the first one
Explanation:
4 mol is the highest of the Bunch and 4.0L is the lowest making the first answer the correct one
2 moléculas de clorato de potasio (KClO3) forman 2 moléculas de cloruro de potasio (KCl) y 3 moléculas de oxígeno (O2
The complete question is as follows: 2 molecules of potassium chlorate (KClO3) form 2 molecules of potassium chloride (KCl) and 3 molecules of oxygen (O2). Write a balanced equation for this reaction?
Answer: The balanced chemical equation is [tex]2KClO_{3} \rightarrow 2KCl + 3O_{2}[/tex].
Explanation:
A balanced equation is defined as the equation which contains same number of atoms on both reactant and product side when a chemical reaction occurs.
Hence, when 2 molecules of potassium chlorate [tex](KClO_{3})[/tex] form 2 molecules of potassium chloride (KCl) and 3 molecules of oxygen [tex](O_{2})[/tex] then its balanced equation will be as follows.
[tex]2KClO_{3} \rightarrow 2KCl + 3O_{2}[/tex]
Here, number of atoms on the reactant side as as follows.
K = 2Cl = 2O = 6Number of atoms on the product side are as follows.
K = 2Cl = 2O = 6Since, the number of atoms on reactant side are equal to the number of atoms on product side. So, this reaction equation is balanced.
Thus, we can conclude that the balanced chemical equation is [tex]2KClO_{3} \rightarrow 2KCl + 3O_{2}[/tex].
Magnesium lon has less electrons than its atom
True
False
In vascular plants, the absorption of water from the soil into root hairs depends principally upon the presence of a
A. phototropic response by the root hairs
B. geotropic response by the conducting tissue
OOOO
C. higher concentration of water in the soil than in the root hairs
D. higher concentration of water in the root hairs than in the soil
Answer:
the answer is C) higher concentration of water in the soil than in the root hairs
Explanation:
Answer:
the answer is c
Explanation:
i just got it
Calculate the percentage of water of crystallisation in MgSO⁴ 7H²O
Answer:
Formula of EPSOM salt = MgSO4.7H2O
molecular mass of MgSO4.7H2O = atomic mass of Mg + atomic mass of S + 4 × atomic mass of O + 7 { 2 × atomic mass of H + atomic mass of O }
= 24 + 32 + 4× 16 + 7{ 2 × 1 + 16 } g/mol
= (24 + 32 + 64+ 126 ) g/mol
= 246 g/mol
molecular mass of total water = 7 × ( 2× atomic mass of H + atomic mass of O )
= 7 × 18 = 126 g/mol
now ,
% mass of H2O in EPSOM salt = {total molar mass of H2O/molar mass of Epsom salts }× 100
= {126/246 } × 100
= 12600/246
= 51.21 %
Explanation:
i have done it hope it helps
What is the difference between a chemical and physical change?
A properly designed experiments changes one variable at a time. A student wanted to know which type of sugar would yield the greatest amount of energy for the cell when metabolized during cellular respiration by mitochondria. The student mixed yeasts in three different sugar solutions: maltose, glucose, sucrose. The three sets of yeasts were monitored to determine which sugar type yielded the most energy. List three factors that the student must keep constant during the experiment
Answer:
The amount of water
The amount of sugar and
The amount of yeast
Explanation:
A constant variable is that variable in an experiment which must be kept the same for all groups in order not to alter the results of the experiment.
In this question, the independent variable i.e. the variable being manipulated is the TYPE OF SUGAR USED while the dependent variable i.e. variable that responds to change is AMOUNT OF ENERGY. Three different types of sugar were used viz: maltose, glucose, and sucrose. To not alter the outcome of the experiment, the constants of this experiment i.e. variables that must be the same for all groups of the experiment, include the following:
- The amount of water
- The amount of sugar
- The amount of yeast used
PLEASE HELP!
this is due tomorrow and i really need help!!! this is for my final grade! thank you
Answer:
what the--
Explanation:
pls tell one by one
If no loss or gain of electrons occur by mixing of two atoms, we say that they may be attached to each
other due to
A proton attraction
B neutron attraction
C sharing of electrons
D opposite charges
<
Answer:
The correct option is option C
Explanation:
Loss or gain of electron(s) occurs in a type of attraction known as electrovalent or ionic attraction. In this type, there is transfer (or loss) of electron(s) from a metal atom to become positively charged while a nonmetal accepts (or gains) this electron to become negatively charged.
When this does not happen, two metal atoms can become attached by sharing the same electrons through a form of attraction known as covalent bonding. Here, the two atoms share electrons (known as shared pair) together to achieve there octet configuration on the outermost shell.
The diagram below represents a beaker of water being heated by a flame. The arrows represent heat
transfer occurring in the beaker.
Which process is represented by the arrows in the diagram?
O condensation
O conduction
O convection
O radiation
Answer:
condensation
Explanation:
when heated beaker sed condensation
The atom of element has 25 electrons and 30 neutrons write down its atomic number and mass number.
Answer:
Atomic number = 25 protons
Mass number = ( 25 + 30 ) = 55
Which type of biomacromolecule contains paired bases? A. Nucleic Acid B. Carbohydrate C. Lipid D. Protein
Answer:
D.Protien
Explanation:
DNA has four nucleobases: adenine, thymine, guanine, and cytosine. The nucleobases in a DNA strand have preferred partners to form hydrogen bonds with. Cytosine pairs with guanine, and adenine pairs with thymine. These are the base pairing rules that allow DNA replication and protein synthesis to happen.
What are the various ways in which an atom of an element can achieve the noble gas configuration ?
Answer:
Atoms attain noble gas configuration by obtaining or donating and sharing of electrons present in their outermost shell.A 217.6 sample of gas is collected at 9.011 atm and 127.8°C. What volume does the gas have at 44.9 atm and 11.9 °C?M
Answer:
The correct answer is = 31.04
Explanation:
The relation between volume, temperature and pressure of a fix amount of a gas can be expressed by the combined gas law:
PV/T = k
It can be written as well as
P1V1/T1 = P2V2/T2
Given:
V1 = 217.6
P1 = 9.011 atm
T1 = 127.8°C = 400.95 K
P2 = 44.9
T2 = 11.9 °C = 285.05
Solution:
Putting value in the formula
V2 = P1V1T2/P2T1
= (217.6*285.05*9.011)/44.9*400.95
V2 = 31.04
Sodium is less reactive than potassium.
Answer:
Sodium atoms due to being smaller in size have high ionization energy and thus, it can't lose electrons easily and is more stable and less reactive. ... Hence, from this it is clear that sodium is less reactive than potassium.
Explanation:
Plz help..
How to name alcohols...
Answer:
Alcohols are usually named by the first procedure and are designated by an -ol suffix, as in ethanol, CH3CH2OH (note that a locator number is unnecessary on a two-carbon chain). On longer chains the location of the hydroxyl group determines chain numbering. For example: (CH3)2C=CHCH(OH)CH3 is 4-methyl-3-penten-2-ol.10
Explanation:
Answer:
ethanol formula :C2H5Oh
Write the electronic configuration of calcium and potassium.
Answer:
Calcium= 2,8,8,2
Potassium= 2,8,8,1
Answer:
Electronic configuration of Potassium (K)Atomic number of potassium = 19
Therefore number of electrons = 19
Since, maximum number of electrons in outermost orbit will not be more than 8, thus the 19th electron of potassium atom will reside in 4th.
Thus, electronic configuration of potassium is
given in first pic.
Number of orbit in potassium = 4
Electronic configuration of Calcium (Ca)Atomic number of calcium = 20
Therefore number of electrons = 20
Thus, electronic configuration of calcium is given in sec pic.
Number of orbit in calcium = 4
Explanation:
❤️(◍ Jess bregoli ◍)❤#keep learning!!
The equilibrium constant (K) for the reaction
2HCI(g) = H2(g) + Cl2(g)
is 4.17 x 10-34 at 25°C. What is the equilibrium constant for the reverse reaction at the same
temperature?
H2(g) + Cl2(g) = 2HCl(g)
Answer: The equilibrium constant for the reverse reaction at the same temperature is [tex]2.40 \times 10^{33}[/tex].
Explanation:
The given reaction equation is as follows.
[tex]2HCl(g) \rightleftharpoons H_{2}(g) + Cl_{2}(g)[/tex] ... (1)
It's equilibrium constant (K) value is [tex]4.17 \times 10^{-34}[/tex].
Also, another reaction equation is as follows.
[tex]H_{2}(g) + Cl_{2}(g) \rightleftharpoons 2HCl(g)[/tex]
This is the reverse of equation (1). Hence, its equilibrium value is calculated as follows.
[tex]K' = \frac{1}{K}\\= \frac{1}{4.17 \times 10^{-34}}\\= 2.40 \times 10^{33}[/tex]
Thus, we can conclude that the equilibrium constant for the reverse reaction at the same temperature is [tex]2.40 \times 10^{33}[/tex].
How many particles are in 13.5 grams of Beryllium ?
There would be 9.03 x [tex]10^{23}[/tex] particles in 13.5 grams of Beryllium.
Recall that 1 mole of a substance contains 6.02 x 10^23 atoms.
Number of moles in 13.5 grams of Beryllium = mass/molar mass
= 13.5/9
= 1.5 moles
Thus, total number of atoms in 1.5 moles Beryllium:
= 1.5 x 6.02 x 10^23
= 9.03 x [tex]10^{23}[/tex]
More on the number of particles in a substance can be found here: https://brainly.com/question/1445383